Stéphanie Oneyser is a senior associate in the Litigation and Arbitration Team. She advises in dispute resolutions and represents parties in state courts proceedings, in enforcement and legal assistance matters and in international arbitration proceedings. Her practice focuses on dispute resolution in all aspects of commercial law and on insolvency law.

Stéphanie Oneyser studied at the University of Freiburg i. Üe. (MLaw, 2009) and at the University of Bristol, England (Erasmus). She completed her traineeship in a major commercial law firm in Zurich and worked as a judicial law clerk at the district court of Horgen. She was admitted to the bar in 2013 in the canton of Zurich and obtained the title of Associate in Risk Management (ARM) in 2017 and a Certificate of Advanced Studies (CAS) in tort law and insurance law at the University (HSG) of St. Gallen in 2018. Before joining Walder Wyss, Stéphanie Oneyser worked as an associate in the litigation, arbitration and insolvency teams of a Switzerland-wide operating commercial law firm in Zurich.

Stéphanie Oneyser's working languages are German, English and French. She is registered with the Zurich Bar Registry and admitted to practice in all Switzerland.